Resonant Frequency of a Colpitts Oscillator

  
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This result puts the oscillator in the middle of the UK FM Band (87. 5 - 108 MHz). If L1 has an adjustable ferrite core then its inductance can be altered and fine tuning acheived. If L1 is an air spaced coil then fine tuning is achieved by physically squeezing or separating the turns.
Resonant Frequency of a Colpitts Oscillator - schematic




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